Re: No power management on Bay Trail tablet (Dell Venue 8 Pro)

Re: No power management on Bay Trail tablet (Dell Venue 8 Pro)

[Mika Westerberg]

+Rafael

On Sat, Nov 30, 2013 at 01:56:33PM -0800, Adam Williamson wrote:
> Hi, folks. I recently bought a Dell Venue 8 Pro -
> a Bay Trail / Valley View-based Intel tablet - to try and get Fedora
> running on it. Among the many things I'm currently fighting :), there
> doesn't appear to be any power management going on at all. 'upower -d'
> is pretty much empty, doesn't acknowledge the existence of a battery.

It looks like there is an I2C operation region that the AML code uses to
handle the battery specific things:

    Scope (_SB.I2C1)
    {
        Name (UMPC, ResourceTemplate ()
        {
            I2cSerialBus (0x0048, ControllerInitiated, 0x000186A0,
                AddressingMode7Bit, "\\_SB.I2C1",
                0x00, ResourceConsumer, ,
                )
        })
        Name (AVBL, Zero)
        Method (_REG, 2, NotSerialized)  // _REG: Region Availability
        {
            If (LEqual (Arg0, 0x09))
            {
                Store (Arg1, AVBL)
            }
        }

        OperationRegion (DVUM, GenericSerialBus, Zero, 0x0100)
	...

Unfortunately this is not supported in Linux yet.

Re: No power management on Bay Trail tablet (Dell Venue 8 Pro)

[Rafael J. Wysocki]

+Rui

On 12/2/2013 2:18 PM, Mika Westerberg wrote:
> +Rafael
>
> On Sat, Nov 30, 2013 at 01:56:33PM -0800, Adam Williamson wrote:
>> Hi, folks. I recently bought a Dell Venue 8 Pro -
>> a Bay Trail / Valley View-based Intel tablet - to try and get Fedora
>> running on it. Among the many things I'm currently fighting :), there
>> doesn't appear to be any power management going on at all. 'upower -d'
>> is pretty much empty, doesn't acknowledge the existence of a battery.
> It looks like there is an I2C operation region that the AML code uses to
> handle the battery specific things:
>
>      Scope (_SB.I2C1)
>      {
>          Name (UMPC, ResourceTemplate ()
>          {
>              I2cSerialBus (0x0048, ControllerInitiated, 0x000186A0,
>                  AddressingMode7Bit, "\\_SB.I2C1",
>                  0x00, ResourceConsumer, ,
>                  )
>          })
>          Name (AVBL, Zero)
>          Method (_REG, 2, NotSerialized)  // _REG: Region Availability
>          {
>              If (LEqual (Arg0, 0x09))
>              {
>                  Store (Arg1, AVBL)
>              }
>          }
>
>          OperationRegion (DVUM, GenericSerialBus, Zero, 0x0100)
> 	...
>
> Unfortunately this is not supported in Linux yet.

RE: No power management on Bay Trail tablet (Dell Venue 8 Pro)

[Zhang, Rui]

Hi, Adam,

Can you please attach the acpidump output of this machine, and the dmesg output after boot?

Thanks,
rui

> -----Original Message-----
> From: linux-acpi-owner@vger.kernel.org [mailto:linux-acpi-
> owner@vger.kernel.org] On Behalf Of Mika Westerberg
> Sent: Monday, December 02, 2013 9:18 PM
> To: Adam Williamson
> Cc: linux-acpi@vger.kernel.org; Wysocki, Rafael J
> Subject: Re: No power management on Bay Trail tablet (Dell Venue 8 Pro)
> 
> +Rafael
> 
> On Sat, Nov 30, 2013 at 01:56:33PM -0800, Adam Williamson wrote:
> > Hi, folks. I recently bought a Dell Venue 8 Pro - a Bay Trail /
> Valley
> > View-based Intel tablet - to try and get Fedora running on it. Among
> > the many things I'm currently fighting :), there doesn't appear to be
> > any power management going on at all. 'upower -d'
> > is pretty much empty, doesn't acknowledge the existence of a battery.
> 
> It looks like there is an I2C operation region that the AML code uses
> to handle the battery specific things:
> 
>     Scope (_SB.I2C1)
>     {
>         Name (UMPC, ResourceTemplate ()
>         {
>             I2cSerialBus (0x0048, ControllerInitiated, 0x000186A0,
>                 AddressingMode7Bit, "\\_SB.I2C1",
>                 0x00, ResourceConsumer, ,
>                 )
>         })
>         Name (AVBL, Zero)
>         Method (_REG, 2, NotSerialized)  // _REG: Region Availability
>         {
>             If (LEqual (Arg0, 0x09))
>             {
>                 Store (Arg1, AVBL)
>             }
>         }
> 
>         OperationRegion (DVUM, GenericSerialBus, Zero, 0x0100)
> 	...
> 
> Unfortunately this is not supported in Linux yet.
> --
> To unsubscribe from this list: send the line "unsubscribe linux-acpi"
> in the body of a message to majordomo@vger.kernel.org More majordomo
> info at  http://vger.kernel.org/majordomo-info.html

Re: No power management on Bay Trail tablet (Dell Venue 8 Pro)

[Mika Westerberg]

On Mon, Dec 02, 2013 at 01:41:55PM +0000, Zhang, Rui wrote:
> Hi, Adam,
> 
> Can you please attach the acpidump output of this machine, and the dmesg output after boot?

In the original email from Adam to linux-acpi@ both were attached but
somehow I can't find that email from archives.

Rui, I'll bounce you the original email.

Re: No power management on Bay Trail tablet (Dell Venue 8 Pro)

[Adam Williamson]

On Mon, 2013-12-02 at 15:55 +0200, Mika Westerberg wrote:
> On Mon, Dec 02, 2013 at 01:41:55PM +0000, Zhang, Rui wrote:
> > Hi, Adam,
> > 
> > Can you please attach the acpidump output of this machine, and the dmesg output after boot?
> 
> In the original email from Adam to linux-acpi@ both were attached but
> somehow I can't find that email from archives.
> 
> Rui, I'll bounce you the original email.

In the meantime, I found
https://github.com/rjwysocki/linux-pm/commit/b2a51a6d0f96308251cfa41b793c43d0316e3b16 , which looks like it may be relevant to my hardware. I'm building a kernel with that patch added, and I'll see if it makes any difference.
-- 
Adam Williamson
Fedora QA Community Monkey
IRC: adamw | Twitter: AdamW_Fedora | XMPP: adamw AT happyassassin . net
http://www.happyassassin.net